The accessibility of a city can be measured by general weightedtravel time (Shi & Zhou, 2013). In terms of travel time, the largerthe value is, the greater the accessibility. However, to more clearlyexpress the relation between accessibility and economic agglom-eration index, we alter the form of accessibility expressed by traveltime by taking the reciprocal of travel time and then the indexa-tion to measure accessibility. Considering the factors of time andprice, the general weighted travel time between two cities can beexpressed as: